A comparative study of the conformational mobility of octamethyltetrasiloxane and cyclododecane in the solid state

Autor:	Martin Möller, Detlef Emeis, Hans-Joachim Cantow
Rok vydání:	1984
Předmět:	Cyclododecane Polymers and Plastics Mesophase General Chemistry Condensed Matter Physics Resonance (chemistry) Spectral line Crystal NMR spectra database chemistry.chemical_compound Crystallography chemistry Solid-state nuclear magnetic resonance Polymer chemistry Materials Chemistry Molecule
Zdroj:	Polymer Bulletin. 12:557-563
ISSN:	1436-2449 0170-0839
Popis:	A crystalline mesophase state in which molecules show conformational mobility is discussed for cyclododecane and octamethyltetrasiloxane.13C and29Si solid state NMR spectra show changes of the resonance signals which can be explained by changes of the conformation. The transition temperatures in the NMR spectra are correlated with the thermal transitions detected by DSC. Comparisons with the solution spectra give evidence that in case of octamethyltetrasiloxane, the conformational mobility is determined mainly by the molecular packing in the crystal, while packing effects are neglegibly small for cyclododecane. The data are discussed with concern to the corresponding linear chain molecules, i. e. poly(ethylene) and poly(dimethylsiloxane).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b84a7e9b29cc007bac54cbdda8185d43 https://doi.org/10.1007/bf00958664 Zobrazit plný text záznamu Full text from SpringerLink